The beauty of the tourist attraction left________deep impression on me and I want to visit it________

second time next month. [ ]

A. a;  the  

B. a;  a  

C. the;  the 

 D. /;  the

滴定管，移液管和吸量管都能准确测量溶液体积到0.01mL，当测量体积大于10mL小于20mL应记录为（）位有效数字。

A.3

B.5

C.2

D.4